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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756aa29b134b71139edecb8ef284ea3f50f7e0023aa6ad285f924d8ba6581cd6' 
  AND token = 'IvRohykOr9/K7NHj/FxFYxCaGahnRz4Hp/e0c4yh0LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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