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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4ba0d4a11f2b10d7e0d110c0521e278a1f1fce823f63ad1615593363b68dd2' 
  AND token = 'OZ9QwrqxjjBq6/Sibz14Pf+Yy05fwfKDEQWyZvfzti0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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