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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a267ea4bf25a29188124568608072a556f6d5ed005aeb5d30a46bae550029c' 
  AND token = '/qzPFJA/Zc6kbkw1jnIzqDlirpDIErgay6WBPY/YZLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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