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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33dc10ec14bdf65f8fbde3bc2eba429d0c34ba9d9f160d3685e1d82ef082630' 
  AND token = 'fwnpQESez+TGws529dUHE+sec15mUE0JTnu2Ut4D8eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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