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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec2947257e7ef0a45b90d4af15033bb583032da0d111647482ee89ee0363e8f' 
  AND token = 'p0QgrHCI3PKYNRuG59kid5LYh0e+94GHDP3zXUM88IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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