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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76eb7e7e60473c1b98c867dac86a476e5929b859daaf01ba57e31729f2cc7930' 
  AND token = 'u3noIIHF2aX+p5DYNF0DCNd7uv0RqK9E03+Zky/rTO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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