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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4c400d6e1974d9a5ccfd264ed623347f65f2acbc40f70df50b2e68a4571dee' 
  AND token = 'PRFXiUWpsQkyjMOIGTu9vG4X/h7fShFCJQMVQDQGLJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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