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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd31553b821056a6ddd4a87aa589c2fa4a67318cab71ab38d55f0939974f20f' 
  AND token = 'VfWcSur9ZQ72O6IGA5i5qkKTVku6vlbHkVxAWJr1G+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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