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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64af528591a02a7d151433d7a2bb0182f1e6216c5b40703c276e02dccc5578c3' 
  AND token = 'uIxavAOJP40OklTHq7mkKdSVk5xjSVIGlqlC1nWxL3c=' 
  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"
    }
  }
}