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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805389b06e863bf57c95d37f50a71532c7d35f129721f9b054f93c1a206c7e25' 
  AND token = 'P6Y0gEumVY7AzTb+PKQ0ys7xPMx6AvTc/2czZX15QpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}