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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0ea9fd18a8507a9b9d8a634ec5c8c511b902a3b290d6144509382a4be1c19e' 
  AND token = 'F4watg5qpYYwFUHmwW44OTVSxA3As2ZLQOm/WgJeilk=' 
  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"
    }
  }
}