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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f059816f59bd05267ab15fe3df64aae37ea863ae8667f9a7e4a589a67b007daf' 
  AND token = 'M0P2xLa6peZaY2k068T5JRN07SwowD9HiEwb97jf2go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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