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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296e95f88fc71d702c4484e0378440874058fee86e459ce49ab547ed3a0d1520' 
  AND token = 'nWcva72BwHASW8QNYjqafIvKb2tgnVZUuziADuo9Cb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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