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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f828dbf6ca4ff3ea7e0ace64dad253b2f058f616963d6efc0193715674cc6ecc' 
  AND token = 'Wt4usjvnJjaB2Ch/wwtm0aB5eX03B/LfdaSt9L/YP1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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