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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2934aed0fdddc2fdc20c21aec2e590c649c056b5cb640fd1ce29165bdd8efb2e' 
  AND token = 'KWwrblarSW7GSwO5QTmw/ozL+RWe43PfFa5CWu9/uyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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