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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541868c9d3e6e12786c14d1f78f78cf1e9e32d0980249176c34610d338fc0703' 
  AND token = 'oCtY9Zz7aoJYeud2KmOcq3KPARsCA63pQsmBxumJCk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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