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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e902c1e09366a2f7f84ffef2f988c1ed7e1b8fefc0cae1b4906ba142b3942c0' 
  AND token = 'FvCFAlfMgMEpqwfsA3lTfYtZjPfCG8RkxybefmklRMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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