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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a018eac24ce95a666a7b049826da878f3902330141fe28ef8d19b399f6f4f2' 
  AND token = 'g6CxnWdHQ51ifSZ5uKihad0qUeVy2mYKsuolw6yrEQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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