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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a4a38af276fddda9dec1c2865adbac143f1d2b7288d21724f7a80a4af6e61a0' 
  AND token = 'SoPrpEHkjYwYXAxRN1EKu9jF9VQ0NcgLRvWEw8RcP54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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