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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331b9df832265af0d84a53c6f30902833f4b52a5a0e72fe208a1376fc70a09fa' 
  AND token = 'rmfWnVKhr9v+MSO/h7AQDPK4ijv+Wki+kovufrRIVek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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