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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1081788530cc15c22c0117045541f9f6a82fe9b587087907a44d3160511e60' 
  AND token = 'rlSMDzzUnw9vErpaaIeAOLc5g/RgZJ8wD0u6zpdInZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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