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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5bc6799ff0a9bbda4ecf58d26b4928911230d62b94a19694e944d4270d77c00' 
  AND token = '2ptq9lij2j2dG8jOzbBb+mZ2S9Pt+xwqH0gwNPokWfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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