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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97634e6d113ebfb8e936e797de5127f24d3d64d456ab4d75b5d8c1d18b841a97' 
  AND token = 'pLpCZBNDi4X9gfNXr/Fmgvsv9Byq8SQVNSWT7p3wRqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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