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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e482856a7e92202d821502344fed33c1eadde70fb0774566d94b1a5925e5a52' 
  AND token = 'QaqWKncW3KOmiTY4oGRN/KE9JW0BoRGb4SudbqCscbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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