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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '916db4d5c22fb9b6bb8a88948d91ce07dd894e4897a363b4d72955f95a643506' 
  AND token = 'Be86cKA/KJd1gtj6YeD+3diTN9Tf2PD94sre23vy2Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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