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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee786350932bc50bb9cc144f15519cd07b2a824eeb73fe45af7ea787710ed541' 
  AND token = 'o7uzStD/Gg5HaOKftqymmpJA9PGsu5AGd4nDRdePydA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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