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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5f0baf91c5d1f737c8cbaa0d1e703e5a40549c35714111da533725ed9da859' 
  AND token = 'BEIMFi1zJaQwB42lupOPygygYgk9ZX0R81lf2qLwENA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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