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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5717b00432b8502da3c328f05a4292b9cc17d11961d5385d1c88836d5fa0d67' 
  AND token = 'pSI7szIVjrM71TuyQ5t8WmONbJOnt3e63ZunvJIvJhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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