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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e242a5dee1bc090ae80ba742e5e933c726b7daa57f6acc2f2ef5348b000527ae' 
  AND token = 'JWpziFoolz/FxyKNeVkRX6De3Mvksb3MifaigRqwpec=' 
  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"
    }
  }
}