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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f910c2855cdad7947892d1e881c72fb443cdd04d9bdb5be7894fa7bec7b4a691' 
  AND token = 'Zwyoe4WK9OScPKl1O1EFmFNYHy9a3GlT+3O63t4c0+Y=' 
  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"
    }
  }
}