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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb973be07a3d0f8b513bc363087ef3e2137d9f4e6cb91cc90db70243b99907d' 
  AND token = '1vk0RaA455zwvnKkWB973lctdZhwp9aBu/bVMB/Jpn4=' 
  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"
    }
  }
}