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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb39b49d0c91c309b4cdf04437aba175b34e9cbcb12a0867d706baaccf90b878' 
  AND token = '75q2umnz0hHEx4Buop1Y/qZ3npW2hUnYbcD5GNT6Q3A=' 
  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"
    }
  }
}