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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86707a50199ac749e776125f69c293efe1590c385877c8e7a685b7e6e6838579' 
  AND token = 'j0ZOumHm1Wpc9u4Pp0yVSjbKRT25dLFArb1Com5vQVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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