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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a6ec16486f1418befe61905cbd2339ee3525a910ce86aab0e4c349bd42f39c' 
  AND token = 'E1Rhag6gqE6CoCTHhHSk23S9euozCbnoULx+/1dQCfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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