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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae30bddc2cd6bb6739f4ac1659aae90a22b2ecc78cd10800586be806778375a' 
  AND token = 'SB8+6t+LP1r0xUNe3u5/DKEdzEN3ISbsLS7cP88xDNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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