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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f947907ae15ef84598bf1b59a5a2e5432337de4152a7995825557f39e3bc367a' 
  AND token = 'pN5mT/qBogoQ38LMAtcYkXfWtwJCbinKNKobV3M+oXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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