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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c8b0b7d30f24c507b1d25c196843c73970503aff604ef1c24db3a25fc2828d' 
  AND token = '//aseY4J5oD2UWRFrnpXDp/IWg64slo1qjbokT5pPqw=' 
  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"
    }
  }
}