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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a6812be6ef12f8abd8a0cdb8db18ea9d1b1a74422eaef0922e3401a7e5de74' 
  AND token = '3X2zkerPQF8x1RKyHOUwLe3wVFLeuT0F4yh2ELJCYNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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