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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a20026861c02a4ccf9c2be020686c1c805a4c2d50806f4debc045897cb72ed' 
  AND token = '0Y0h1XuICVRTIk0KqWSyo6+K8BJkuwk1yKQkR71vcn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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