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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02863aa90f53d98379040a2fb86dfd86cbda8122b99c9b984f3e3d30c9b44173' 
  AND token = 'ZZgcfhnWSiqtGReZmfXBLciuytu/UBs9o8maLnLQijw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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