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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7312badaaba0805cdc0b5ce2b7e0e05a307278a9be099ea11a3946d0b963edf' 
  AND token = 'uCH8Po0nINOWPPfVBbwJn0uzTuibK/L1a5AuahVaML0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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