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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3a26c3399eabdfc6772ddbe7776cb5a70b93b5a8cd6f4befd22fdaa218490c' 
  AND token = 'wn2PabIqu6hpEw7hfCelA1cFGsR2J9qPFJaSJopxcfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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