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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0609310b0e5057125716fb85eff298375c86566de3fd54e138db672eb81cfaad' 
  AND token = 'mRGaA8nvVHK//4JH4xR4B1xRoQ2yEY21iKhu/aj8Srs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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