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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986e77ccb118a7f4fe4abb20ef89d7bb6428e6b5ec71eda9ada80361e8c2d1c2' 
  AND token = 'RcFNR297pk8EVTZUB00URFxVz7UeVBNKZ0DpvClSIuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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