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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d5202227c56dc37f99b7a39716d03e2030cc36d7f0079f229703bf2fc7f0b1' 
  AND token = 'zELfNSShUeDN7/rSse2wT9yiL7n/xHMiUv3LpC5f0Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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