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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a23fe2fe86267ca42c2059593aa69419013bd045c18ded6411fb3e501980c8' 
  AND token = '2SGqYxboREGsL3MAncvkFlQUL5p421MozfyChN8VWbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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