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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5614ac63855496a0cf7639041f398c0b2c4e433ed7c3e9211a35592d137c8a0c' 
  AND token = 'y6HgSt3waO+AckC/K3hr8cCQE3KiqZ24Xxoz2VYsXB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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