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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb503dc3f79d012b2d4532a62ad42fa0243298cfff62d4cd583f905fc20baedc' 
  AND token = 'mft0ycuM9OIksaq4Wl7dYJA8CfCGYN3EFBpZ4+f0ohk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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